Toronto Public Health is trying to locate at least 60 people who may have come into contact with a rabid dog sold at a city flea market.

Health officials would like to hear from anyone who may have come into contact with the puppy -- or any puppy sold at booth number 1513 at Dr. Flea's Market, at Highway 27 and Albion Rd., on Jan. 13.

"This dog was at a very busy flea market and we're not exactly sure how many people came into contact with this animal," said Tre Smith of the Toronto Humane Society.

Concerns arose after a sick dog bit a worker at the Toronto Humane Society about one week ago. The border collie cross died later that night, and test results showed it had rabies.

"It's very, very scary and very concerning. Rabies is real and it's potentially fatal to whoever contracts it," said Smith.

According to Toronto Public Health, rabies is a rare condition in Ontario. But since it can be deadly for humans, people who are exposed to the rabies virus must be vaccinated to prevent illness.

The virus is found in the saliva of a rabid animal and can be spread through a bite, cut, or scratch. It can also be transmitted if the saliva comes into contact with the moist tissues of the mouth, nose, or eyes.

The worker who was bitten by the dog has received rabies shots and is doing fine, but health officials say others may still be at risk.

There were two other puppies in the cage with the infected dog. It's believed the dog comes from a breeder in the Owen Sound.

Officials say the incident highlights the need for customers to do their homework before buying pets.

"Licensed and responsible breeders don't sell dogs at flea markets for 200 dollars," said Smith.

Toronto Public Health is asking anyone who may be concerned about contact with the rabid puppy to call them at 416-338-7600.